A Sample of Silicon Has Three Naturally Occurring Isotopes: Si-28

question 99

Multiple Choice

A sample of silicon has three naturally occurring isotopes: Si-28 (mass 28.0 amu) ; Si-29 (mass 29.0 amu) and Si-30 (mass = 30.0 amu) . If the average atomic mass of silicon is 28.1 amu, which isotope is the most abundant?

• A)Si-28
• B)Si-29
• C)Si-30
• D)All isotopes have the same natural abundance.

---

Definitions:

Ecotourism

Responsible travel to natural areas that conserves the environment, sustains the well-being of the local people, and involves interpretation and education.

Indirect Value

The benefits provided by biodiversity that do not have direct economic value, such as climate regulation and pollination.

Indirect Values

Benefits provided by ecosystems that do not have a direct economic value, such as climate regulation and cultural significance.

Biodiversity

The variety of plant and animal life in the world or in a particular habitat, considered important for maintaining ecological balance.